Heater control switch 328 part number 6188300

On a somewhat related topic, Deoxit also works great to free-up sticky door lock mechanisms too.
- Dave

 

Looking back at Post #4 it might be possible to resolder contacts inside the switch. I dont have any experience with these switches but might be worth a try considering the scarcity. Glad the deoxit worked out, as they say, "I put that stuff on everything" - switches, plugs / connections, grounding points, relay connections, etc.

 

My drivers side heater control with one red light lit, fails to power the motorized heater valve under the front hood. I’m not sure whether it’s the switch or the heater valve motor. I’m going out to my mechanics today with the car for new brake line installation and will investigate it with multimeter, etc.

 

Today we investigated the heater valve situation, Good News And Bad News.

The Good News:
The heater valve motor had very dirty electrical plug connections.
Deoxide D5 cleaned it rightup. The motor immediately started working and the switch lights illuminated. Success !

The Bad News:
As soon as the valve opened up, the valve began to leak

I began reading old threads here and found that the part is no longer available from Ferrari, but Maranello Concessionary has a alternative part for approx $500
Another poster here on Ferrari chat mentioned that his heater valve only leaked when opened ALL the way up. If you stop before fully opened, the valve doesn’t leak. We pressurized the system To test and it turned out to be true. So, stop before all the top heater light is illuminated and you’re ok for now.

I also played around with the switch and found the first heater light staying illuminated was sporadic. Mostly stays on, but sometimes goes out after using the heating system for a bit and then turning it all off. It usually lights back up though.

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I live in Florida, and seldom if ever use the heater, so this was a solution to a slightly leaking valve on my 3.2 Mondial, probably would have been better to replace the valve but I just had a major service done and didn't want to tear into the engine compartment again, it works for me!
Alden
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4 Seasons is a major supplier of HVAC parts for cars. I just spent 3 or 4 minutes flipping through their heater valve selection and saw several that looked like they would be as easy to convert a 328 to as the one offered by Maranello Classics. They were under $50.

 

I dont think we need to resort to anything so limited in function. The world is full of cheap readily available heater valves that we can actually adjust

 

It would also be interesting to take a 328 valve apart and see if it can be rebuilt or resealed.

 

Here’s a video I found on possible repair solution
What do you guys think ?

 

Someone bought the available heater valve from Eurospares and found it to not work like the oem version

 

I am sure it requires some level of conversion. But for $400 I can do a lot of fabrication to make a generic valve work.

I still think the best plan is to see if the originals can be fixed

 

Did you watch the video I posted about inserting a small screw without opening the case ?

 

Yes. Not sure if it it representative of all but a good start.

 

Yes, clean then fix the old, the seal may be a flat piece you can cut raw piece to make your new one

 

To add a data point to this discussion: here is an image of a 328 heater valve from a dismantled UK car with part number (Bosch?) visible (0928400017); I presume the “549” is an inspection stamp


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Here you find how to open and repair a heater valve= #10

https://www.ferrarichat.com/forum/threads/heater-valve.601331/#post-148778025

 

Good information. Surprised its Bosch.

 

Bosch 0928400627 appears to mount the same but is fuel regukatore valve
Did they select an odd product to re-purpose? LOL

https://www.amazon.com/Pressure-Regulator-Valve-0928400627-0928400617/dp/B07VQKRTXS

 

The ac/ heater control centre console switches for sale on eBay at moment, haven’t seen any pop up for years in UK if anyone interested plus they other switches against seller
https://www.ebay.co.uk/itm/257107238504